James btdwell



J. BIDWELL. 7 MACHINE FOR FACING GRINDS'TO'NBS.

No. 38,782. Patented June 2, 1863.

UNITED STATES PATENT OFFICE.

JAMES BTDWELL, on NEW YORK, is. Y., AssIenoR T0 HTMsEL AN WILL.- IAM W.MARSTON, or SAME PLACE.

MACHINE FOR FACINGTGRINDSTONES.

Specification forming part of Letters I. tcnt No. 38,782., dated June 2,1863.

To all whom it nmy concern.- 7

Be it known that 1, JAMES BIDWELL, ot'the city and State of'New York,haveinvented, made, and applied to use acertain new and useful ImprovedMeans for Facing Grindstones; and I do hereby declare the following tobe afull, clear, and exact description of the said invention, referencebeing had to the annexed drawings, making part of this specification,wherein- Figure l is a plan of-the grindstone with the tool-restremoved, and Fig. 2 is an elevation of the grindstone with the frame andtoolrest in section.

Similar marks of reference denote the same parts.

Grindstones when in use wear smaller by the constant use, and the restupon which the tools are placed hence is farther from the surface thanis convenient besides this, in grinding and sharpening tools the surfaceof the stone becomes uneven, and the stone being harder in some placesthan in others makes the same wear untrue and the stone wabbles.

The nature of my said invention consists ,in

to the grindstone as the same wears away, and

in a roller of bent or angular plates rotating by contact with thesurface of said grindstone, and keeping the same perfectly true bypressing upon and abrading, chipping, or crumbling away such portions ofthe surface as may project beyond the true circle formed by the rotationof said stone, and this roller and toolrest, being adjustable together,are brought up constantly to the surface of the grindstone as that wearsaway.

In the drawings, n represents the frame of the grindstone, of anydesired character, and his the grindstone, mounted and driven in anyusual way.

c is an adjustable frame held to a by the screw d, and provided with ascrew, 0, or its equivalent, to force said frame 0 toward the grindstoneas occasion may require.

the frame c, and carryihgmetallic disks kept apart by washers. Thesedisks should either be corrugated, as shown, or set at a slight angle tothe shaft, in order that said plates, in

the grindstone. The tool-rest g is attached to,

the frame a, as represented, and forms a cover .to the roller f, and isalways at a convenient proximity to the surface of the stone.

he disks composing the roller f may be corrugated, as shown, and set ataslight angle to the axis of the roller, in order to act on the surfaceof the stone more uniformly.

What I claim, and desire to secure by Letters Patent, isi 1. Thetool-rest'g, in combination with the adjustable frame 0, as specified,whereby said toolrest ismoved up to the stone as the stone wears, as setforth.

2. The roller f, composed of a series of metallic disks and taking theentire face of the grindstone and pressed thereto, substantiallyas andfor the purposes specified.

3. The combination of the roller f, tool-- rest g, and adjustable frame0, for the purposes and as specified.

' In witness whereof I have hereunto setany signature this 25th day ofh'larch, 1863.

JAMES BIDYELL.

Witnesses:

'LEMUEL W. SERRELL, Gius. H. SMITH.

j is a roller, composed of a shaft running in,

